Synthesis of sulfur dichloride

Preparation of sulfur dichloride

Sulfur dichloride is obtained by treating sulfur monochloride with chlorine.

Preparation of sulfur dichloride

Preparation of sulfur dichloride

Fifty grams of sulfur monochloride are placed in the distilling flask. About 0.1 g of iron powder is added to the liquid as a halogen carrier and dry chlorine is led in steadily (3-4 bubbles/sec) for one-half hour. The dark liquid that is produced is allowed to stand one hour and then one millilitre of phosphorus trichloride is added. The prod­uct is fractionated through a small column packed with glass and the portion that boils at 55-62°C is collected. This fraction is redistilled as before from a few drops of phosphorus trichloride and the pure sulfur dichloride is collected at 59-61°C. Yield about 55 g. The deep-red material is stable for several days at room temperature in the presence of a trace of phosphorus tri­chloride; it then slowly decomposes into chlorine and sulfur monochloride and may be re-purified by distillation as described.

With water, the dichloride forms sulfuric acid, sulfur, and a mixture of thionic acids, H2SxOy. Sulfur dichloride soluble in hexane, carbon tetrachloride, carbon disulfide, and ethylene dichloride.

Inorganic laboratory preparations, by G. G. Schlessinger, 120-121, 1962


chlorosulfanyl thiohypochlorite



InChI Key


Canonical SMILES


MeSH Synonyms

sulfur chloride, sulfur monochloride

Depositor-Supplied Synonyms

Disulfur dichloride, SULFUR MONOCHLORIDE, Chlorosulfane, Sulfur subchloride, Sulfur chloride (S2Cl2), Thiosulfurous dichloride, Siarki chlorek, Disulphur dichloride, Sulfur chloride (di), Siarki chlorek [Polish], chlorosulfanyl thiohypochlorite, HSDB 826, EINECS 233-036-2, 10025-67-9, dichlorodisulfane, ClSSCl, Sulfur chloride(di), Dimeric sulfenic chloride, AC1L2NOS, S2Cl2, UNII-NJ7YR2EV0D, NJ7YR2EV0D, Sulfur monochloride solution, Bis[chloridosulfur](S CS), UN 1828 (Salt/Mix), 157759_ALDRICH, PXJJSXABGXMUSU-UHFFFAOYSA-N, LTBB002594, BP-30228, LS-148158, 3B4-3841

Removed Synonyms

Sulfur chloride, Chloride of sulfur, CID24807, 12771-08-3

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